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Problem 256. Equilateral Triangle, Circumcircle, Point, Vertices, Distances. Level: High School, College, SAT Prep.

The figure shows an equilateral triangle ABC inscribed in a circle. If a point D is on arc BC, DA = d, DB = e, and DC = f, prove that d = e + f. View or post a solution
 
 

Equilateral triangle inscribed in a circle
 

See also:
GeoGebra of problem 256
 

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